mz0/ZFS-on-Microserver.md Secret

## ZFS-on-Microserver.md

      
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              ZFS-on-Microserver.md
            
          
    https://github.com/zfsonlinux/zfs/wiki/Ubuntu-18.04-Root-on-ZFS
2.3 Create the root pool:
2.3a Unencrypted:
Delete GPT copy at end of disk:
# dd if=/dev/zero of=/dev/disk/by-id/ata-TOSHIBA_HDWD130_95FE8EEKS bs=4k seek=732566645 count=1
## Verify:
# dd if=/dev/disk/by-id/ata-TOSHIBA_HDWD130_95FE8EEKS bs=4k skip=732566645 count=1 |od -x

# time zpool create -o ashift=12 \
      -O atime=off -O canmount=off -O compression=lz4 \
      -O xattr=sa -O mountpoint=/ -R /mnt/rpool \
      rpool raidz \
   /dev/disk/by-id/ata-TOSHIBA_HDWD130_95FE8EEKS \
   /dev/disk/by-id/ata-TOSHIBA_HDWD130_683T527AS \
   /dev/disk/by-id/ata-TOSHIBA_HDWD130_683T827AS \
   /dev/disk/by-id/ata-TOSHIBA_HDWD130_58VSRTAAS

   
real	0m3,843s
user	0m0,018s
sys	0m0,017s

# zpool status
  pool: rpool
 state: ONLINE
  scan: none requested
config:

	NAME                               STATE     READ WRITE CKSUM
	rpool                              ONLINE       0     0     0
	  raidz1-0                         ONLINE       0     0     0
	    ata-TOSHIBA_HDWD130_95FE8EEKS  ONLINE       0     0     0
	    ata-TOSHIBA_HDWD130_683T527AS  ONLINE       0     0     0
	    ata-TOSHIBA_HDWD130_683T827AS  ONLINE       0     0     0
	    ata-TOSHIBA_HDWD130_58VSRTAAS  ONLINE       0     0     0

errors: No known data errors

3.1
# zfs create -o canmount=off -o mountpoint=none rpool/ROOT

3.2
# zfs create -o canmount=noauto -o mountpoint=/ rpool/ROOT/ubuntu
# zfs mount rpool/ROOT/ubuntu

3.3
root@q:/# zfs create                 -o setuid=off              rpool/home
root@q:/# zfs create -o mountpoint=/root                        rpool/home/root
root@q:/# zfs create -o canmount=off -o setuid=off  -o exec=off rpool/var
root@q:/# zfs create -o com.sun:auto-snapshot=false             rpool/var/cache
root@q:/# zfs create -o acltype=posixacl -o xattr=sa            rpool/var/log
root@q:/# zfs create                                            rpool/var/spool
root@q:/# zfs create -o com.sun:auto-snapshot=false -o exec=on  rpool/var/tmp

3.4 (LUKS-only -- skip)
3.5
# cd /mnt/rpool/
# mkdir /mnt/backup
# mount /dev/disk/by-id/usb-Seagate_Backup+_Hub_BK_NA8T1D1P-0:0-part2 /mnt/backup/
# tar tvzf /mnt/backup/lxdU18.tgz |less
# tar xzf /mnt/backup/lxdU18.tgz

4.4
# mount --rbind /dev  /mnt/rpool/dev
# mount --rbind /proc /mnt/rpool/proc
# mount --rbind /sys  /mnt/rpool/sys/
# chroot /mnt/rpool/ /bin/bash --login
(chroot) ? # ln -sf /proc/self/mounts /etc/mtab
(chroot) # apt update 
(chroot) # apt install zfs-initramfs  ### installs zfs-initramfs zfs-zed zfsutils-linux etc.
(chroot) # mount /dev/disk/by-id/usb-SanDisk_Cruzer_Fit_4C532000020531123414-0\:0-part1 /mnt/boot/
### ls -l /boot/initrd.img-4.15.0-34-generic /mnt/boot/initrd.img-4.15.0-34-generic 
### 54115891 Sep 14     /boot/initrd.img-4.15.0-34-generic
### 52378994 Sep 12 /mnt/boot/initrd.img-4.15.0-34-generic

4.11
(chroot) # zfs set mountpoint=legacy rpool/var/log
(chroot) # zfs set mountpoint=legacy rpool/var/tmp
(chroot) # cat >> /etc/fstab << EOF
rpool/var/log /var/log zfs defaults 0 0
rpool/var/tmp /var/tmp zfs defaults 0 0
EOF
(chroot) # grub-probe /
zfs
(chroot) # update-initramfs -c -k all
### 54169482 Sep 14 16:38     /boot/initrd.img-4.15.0-33-generic
### 54168180 Sep 14 16:38     /boot/initrd.img-4.15.0-34-generic
### 54115891 Sep 14 16:24 /mnt/boot/initrd.img-4.15.0-34-generic
### 52314526 Aug 24 17:49 /mnt/boot/initrd.img-4.15.0-33-generic
(chroot) # cp -p /boot/initrd.img-4.15.0-34-generic /mnt/boot/initrd.img-4.15.0-34-generic
(chroot) # <edit grub.cfg>

6.2
(chroot) # exit

6.3
# mount | grep -v zfs | tac | awk '/\/mnt/ {print $3}' | xargs umount -l 
# mount | grep -v zfs | tac | awk '/\/mnt/ {print $3}' | xargs -i{} umount -l {}
# cd /
# zpool export rpool